Apparatus, and associated method, for communicating a data block in a multi carrier modulation communication scheme together with an identification sequence superimposed thereon

Abstract

Apparatus, and an associated method, for facilitating communication of a data block communicated in an OFDM-based, communication system. Side-information required to be transmitted by many PAPR reduction schemes in OFDM is carried and transmitted by sending orthogonal binary sequences superimposed on the OFDM data sequence carrying the information to be transmitted. In one embodiment, a selected scrambling sequence is multiplied with an input data block to yield a desired Peak-To-Average Power Ratio. An identification sequence one-to-one corresponding to the scrambling sequence is superimposed on the resultant sequence and transmitted together. In the receiving station, the identification sequence is determined through correlation operations. This also determines the scrambling sequence. The effects of both sequences are finally removed from the information-carrying data sequence.

What is claimed is: 
     
       1. Apparatus for a communication station operable pursuant to a Multi Carrier Modulation communication scheme, said apparatus comprising:
 an altered data block generator configured to generate an altered data block comprising a selected power indicium formed of a transformed combination of an input data block and a selected scrambling sequence; and 
 a combiner configured to add together the altered data block directly with an identification sequence that is of a sequence length equal to that of the altered data block and that identifies the selected scrambling sequence, thereby to combine the identification sequence directly with the altered data block to form a summed sequence, the summed sequence, when transmitted, transmitting together the altered data block and the identification sequence. 
 
     
     
       2. The apparatus of  claim 1  wherein said combiner is configured to add together the altered data block directly with the identification sequence by superimposing the identification sequence upon the altered data block. 
     
     
       3. The apparatus of  claim 1  wherein said combiner comprises a summer, said summer configured to sum together the altered data block together with the identification sequence. 
     
     
       4. The apparatus of  claim 1  wherein the identification sequence includes real-valued components. 
     
     
       5. The apparatus of  claim 1  wherein said altered data block generator is configured to multiply the input data block together by a scrambling sequence, the scrambling sequence when multiplied by the input data sequence, causes the altered data block to have an acceptable power indicium. 
     
     
       6. The apparatus of  claim 5  wherein the acceptable power indicium of the altered data block comprises a selected Peak-To-Average Power Ratio. 
     
     
       7. The apparatus of  claim 1  further comprising a cyclic prefix part padder configured to prepend a cyclic prefix to the transformed combination of the input data block and selected scrambling sequence, the altered data block and prepended cyclic prefix provided to said combiner. 
     
     
       8. The apparatus of  claim 1  wherein the altered data block generator further comprises an inverse Fourier transform apparatus that transforms the combination of the input data block and selected scrambling sequence. 
     
     
       9. The apparatus of  claim 1  wherein the altered data block is formed of a product of the input data block and the selected scrambling sequence. 
     
     
       10. Apparatus for a communication station operable pursuant to a Multi Carrier Modulation communication scheme, said apparatus comprising:
 a detector configured to detect a receive signal, the receive signal comprising a summed sequence formed of an identification sequence summed directly together with an altered data block exhibiting a selected power indicium and formed of a transformed product of an input data block and a selected scrambling sequence, the summed sequence formed by combining the identification sequence directly with the altered data block; 
 a determiner configured to determine the identification sequence forming part of the receive signal; 
 an identifying sequence remover configured to remove the identifying sequence, identified by said determiner, out of the receive signal; and 
 a Fourier transform apparatus coupled to said identification sequence remover and configured to transform the product of an input data block and a selected scrambling sequence. 
 
     
     
       11. The apparatus of  claim 10  wherein said detector comprises a correlator. 
     
     
       12. The apparatus of  claim 11 , wherein said correlator is configured to calculate a correlation of the receive signal each of a set of possible scrambling sequences to determine which of the possible scrambling sequences exhibits a best correlation with the receive signal. 
     
     
       13. The apparatus of  claim 10 , wherein said detector is configured to detect the receive signal comprising the summed sequence formed of the identification sequence superimposed upon the altered data block. 
     
     
       14. A method for facilitating communication in a communication system operable pursuant to a Multi Carrier Modulation communication scheme, said method comprising the operations of:
 generating an altered data block having a selected power indicium and formed of a transformed combination of an input data block and a selected scrambling sequence by multiplying the input data block with a selected scrambling sequence and inverse Fourier transforming the product; and 
 adding an identification sequence directly to the altered data block, the identification sequence identifying the selected scrambling sequence and being of a length equal to the scrambling sequence, which alters the input data block during said operation of generating the altered data block, to directly combine the identification sequence with the altered data block, thereby, to form a summed sequence. 
 
     
     
       15. The method of  claim 14  further comprising the operation of:
 sending the summed sequence; and 
 detecting reception thereof as a receive signal at a receive station. 
 
     
     
       16. The method of  claim 15  further comprising the operation of identifying the identification sequence subsequent to detection during said operation of detecting reception of the receive signal at the receive station. 
     
     
       17. The method of  claim 16  further comprising the operation of removing the identification sequence, identified during said operation of identifying, out of the receive signal. 
     
     
       18. The method of  claim 14  wherein said operation of combining comprises adding the identification sequence directly to the altered data block by superimposing the identification sequence upon the altered data block. 
     
     
       19. Apparatus for a communication station operable pursuant to a Multi Carrier Modulation communication scheme, said apparatus comprising:
 an altered data block generator configured to generate an altered data block comprising a selected power indicium formed of a transformed combination of an input data block and a selected scrambling sequence; 
 a cyclic prefix part padder configured to prepend a cyclic prefix to the transformed combination of the input data block and selected scrambling sequence; and 
 a combiner configured to add together the altered data block and prepended cyclic prefix directly with an identification sequence that is of a length equal to the transformed combination of the input data block and selected scrambling sequence with the cyclic prefix prepended thereto and that identifies the selected scrambling sequence, thereby to combine the identification sequence directly with the altered data block to form a summed sequence, the summed sequence, when transmitted, transmitting together the altered data block and the identification sequence. 
 
     
     
       20. The apparatus of  claim 19  wherein said combiner is configured to add together the altered data block and prepended cyclic prefix directly with the identification sequence by superimposing the identification sequence upon the altered data block and prepended cyclic prefix. 
     
     
       21. The apparatus of  claim 19  wherein said combiner comprises a summer, said summer configured to sum together the altered data block and prepended cyclic prefix together with the identification sequence. 
     
     
       22. The apparatus of  claim 19  wherein the identification sequence includes real-valued components. 
     
     
       23. The apparatus of  claim 19  wherein said altered data block generator is configured to multiply the input data block with a scrambling sequence, the scrambling sequence when multiplied with the input data sequence, causes the altered data block to have an acceptable power indicium. 
     
     
       24. The apparatus of  claim 23  wherein the acceptable power indicium of the altered data block comprises a selected Peak-To-Average Power Ratio.